Core clamp



Jan. 10, 1950 M|TTERMA|ER I 2,494,350

CORE CLAMP Filed Jan. '26, 1948 Inventor":

Armin FMittermaierj lob/W Patented Jamil), i950 YATES CORE CLAMP iarmin l Mittermaier, Fort Wayne, End, assignor to General Electric Gompany, a corporation oi New York Application January 20, 1948, Serial No. 3,259

1 Claim. i

This invention relates to core clamps and more particularly to a clamp for binding together the laminated core of a small shell-type transformer.

Many small single phase transformers of the shell-type have primary and secondary windings wound one above the other in concentric fashion on the center leg of an E-shaped core whose magnetic circuit is completed by placing in intimate proximity to the three legs of the E a stack of rectangular I shaped punched laminations. In order to bind the core into the prescribed unit a one-piece channel clamp is often used which fits over the two outer legs of the E and completely covers the rectangular I shaped iaminations. This type of clamp is fastened to the laminated core lay the use of four thin metal prongs, two at each end, which are extensions of the sides of the channel and are placed into position over the main body of the E-shaped core. This method is disadvantageous in that the metal prongs are extremely thin and are connected to the clamp proper by only a small neck of metal. Therefore, the pressure which the prongs apply to the E and I shaped stacked laminations is in sufiicient to hold the core parts tightly together.

It is an object of this invention to provide a simple and improved means for clamping to: gether the laminated core structure of a small shell-type transformer, particularly one having a core constructed oi stacked [E and I shaped laniinations.

It is another object oi this invention to provide a simple mounting means for the transformer which means is incorporated as an integral part of the core clamp.

The invention will be better understood from the following description taken in connection with the accompanying drawing and its scope will be pointed out in the appended claim.

In the drawing Fig. 1 is a perspective view of a particular embodiment of this invention showing a core clamp binding the core laminations of a small audio frequency type transformer. Figs. 2 and 3 are perspective views of alternative constructions of the core clamp.

Referring now to the drawing there is shown therein by way of example in Fig. 1 a small audio frequency type transformer I having a core made tip of adjacent stacks of and 'i' shaped laminatlons 2 and 3. @n the central leg 4 of the E. stacked laminations 2 is mounted the transformer coils 5. A clamp (3 is used to bind the laminations and the core sections 2 and 3 together in rigid proximity. The core iaminatlons are bound together by the pressure of the sides 7, 8, and 9 and their corresponding opposite sides which are not illustrated in Fig. but can he seen in Figs. 2? audit. The E and I core sections 2 and 8 are bound together by the compressive force acting Eli between the main body it of the core clamp i and the two binding arms ii and M which are extensions oi the sides 53 and M of the clamp 6 and are bent over, through an angle between 90 and degrees, to fit firmly in grooves i5 and it which are in the main body ll of the E-shaped stacked laminations 2. Punched from. the sides 63 and. i i of the clamp 65 are two mounting test it and thus providing, an integrally incorporated method of mounting the entire unit. Fig. 2 illustrates an alternative construction of the core clamp it having the mounting feet iii and iii punched from the sides 9 of the core clamp 65 rather than from the sides it and i i. Another alternative construction is illustrated in Fig. 3 in which case the mounting feet i8 and iii are punched from the main body it) of the clamp This latter construction has the advantage of preventing any movement of the I shaped laminations within the core.

While there has been shown and described certain particular embodiments of this invention it will be obvious to those skilled in the art that various changes and modifications can be made therein without departing from the invention, and therefore, it is aimed in the appended claim to cover all such changes and modifications as fall within the true spirit and scope of the invention.

What I claim as new and desire to secure by Letters Patent oi the United States is:

In combination, a laminated magnetic core having notches running crosswise of the laminations at opposite ends of one side, a generally U-shaped sheet metal clamp of channel-shaped cross section embracingthe other sides of said core with the ends of the/"legs of said member adjacent said notches, the center parts of the ends of the legs of said member extending beyond the channel forming sides thereof and being arcuately curved inwardly toward each other into a generally U-shaped configuration with their ends fitting into said notches for holding said core and. clamp together.

ARMIN F. MITIERMAIER.

REFERENGES CITED The following references are'oi record in the idle oi this patent: i

- Edwards 28, 1939 

